The other thing to remember is weight,I had Aunger Hustlers 6x13 on my Sunny van and when I found a set of Enkie comp 8 rims they weighed 5.2 kilo's as opposed to the Hustlers at 7 kilo's for the same rim size,the improvement to the feel and handling of the car was so great you really have to swap rims with someone back to back to appreciate the improvement,when you do you will never accept that compromise ever again and that was only about 2 kilo's.
Trx rims are heavy 1200's are light and these areas have a greater affect on lighter cars than with something like a falcon,tyre weight can also be measured before you buy you will be surprised how much tyres vary and you need only use a bathroom scale to check even at the tyre shop.